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| Double fisherman's knot | |
|---|---|
 | |
| Names | Double fisherman's knot, Grapevine, double Englishman's knot |
| Category | Bend |
| Origin | Ancient |
| Related | Fisherman's knot,triple fisherman's knot,double overhand knot,strangle knot |
| Releasing | Jamming |
| Typical use | Joining thin, stiff or slippery lines, backing up critical knots such as thefigure-of-eight loop orfigure-of-eight follow through |
| Caveat | Difficult to untie |
| ABoK | #294, #1415, #498 |
| Instructions | [1] |
Thedouble fisherman's knot orgrapevine knot is abend. This knot and thetriple fisherman's knot are the variations used most often inclimbing,arboriculture, andsearch and rescue. The knot is formed by tying adouble overhand knot, in itsstrangle knot form, with each end around the opposite line's standing part.
A primary use of this knot is to form high strength (round) slings of cord for connecting pieces of a climber'sprotection system.
This knot, along with the basicfisherman's knot can be used to join the ends of a necklace cord. The two strangle knots are left separated, and in this way the length of the necklace can be adjusted without breaking or untying the strand.
Dyneema/Spectra's very high lubricity leads to poor knot-holding ability and has led to the recommendation to use thetriple fisherman's knot rather than the traditional double fisherman's knot in 6 mm Dyneema core cord to avoid a particular failure mechanism of the double fisherman's, where first the sheath fails at the knot, then the core slips through.[1]
